com.google.gerrit.server.git.ReadOnlyRepository.java Source code

Introduction

Here is the source code for com.google.gerrit.server.git.ReadOnlyRepository.java

Source

// Copyright (C) 2015 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.gerrit.server.git;

import static com.google.common.base.Preconditions.checkNotNull;

import org.eclipse.jgit.attributes.AttributesNodeProvider;
import org.eclipse.jgit.lib.BaseRepositoryBuilder;
import org.eclipse.jgit.lib.ObjectDatabase;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefDatabase;
import org.eclipse.jgit.lib.RefRename;
import org.eclipse.jgit.lib.RefUpdate;
import org.eclipse.jgit.lib.ReflogReader;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.lib.StoredConfig;

import java.io.IOException;
import java.util.List;
import java.util.Map;

class ReadOnlyRepository extends Repository {
    private static final String MSG = "Cannot modify a " + ReadOnlyRepository.class.getSimpleName();

    private static BaseRepositoryBuilder<?, ?> builder(Repository r) {
        checkNotNull(r);
        BaseRepositoryBuilder<?, ?> builder = new BaseRepositoryBuilder<>().setFS(r.getFS())
                .setGitDir(r.getDirectory());

        if (!r.isBare()) {
            builder.setWorkTree(r.getWorkTree()).setIndexFile(r.getIndexFile());
        }
        return builder;
    }

    private final Repository delegate;
    private final RefDb refdb;
    private final ObjDb objdb;

    ReadOnlyRepository(Repository delegate) {
        super(builder(delegate));
        this.delegate = delegate;
        this.refdb = new RefDb(delegate.getRefDatabase());
        this.objdb = new ObjDb(delegate.getObjectDatabase());
    }

    @Override
    public void create(boolean bare) throws IOException {
        throw new UnsupportedOperationException(MSG);
    }

    @Override
    public ObjectDatabase getObjectDatabase() {
        return objdb;
    }

    @Override
    public RefDatabase getRefDatabase() {
        return refdb;
    }

    @Override
    public StoredConfig getConfig() {
        return delegate.getConfig();
    }

    @Override
    public AttributesNodeProvider createAttributesNodeProvider() {
        return delegate.createAttributesNodeProvider();
    }

    @Override
    public void scanForRepoChanges() throws IOException {
        delegate.scanForRepoChanges();
    }

    @Override
    public void notifyIndexChanged() {
        delegate.notifyIndexChanged();
    }

    @Override
    public ReflogReader getReflogReader(String refName) throws IOException {
        return delegate.getReflogReader(refName);
    }

    private static class RefDb extends RefDatabase {
        private final RefDatabase delegate;

        private RefDb(RefDatabase delegate) {
            this.delegate = checkNotNull(delegate);
        }

        @Override
        public void create() throws IOException {
            throw new UnsupportedOperationException(MSG);
        }

        @Override
        public void close() {
            delegate.close();
        }

        @Override
        public boolean isNameConflicting(String name) throws IOException {
            return delegate.isNameConflicting(name);
        }

        @Override
        public RefUpdate newUpdate(String name, boolean detach) throws IOException {
            throw new UnsupportedOperationException(MSG);
        }

        @Override
        public RefRename newRename(String fromName, String toName) throws IOException {
            throw new UnsupportedOperationException(MSG);
        }

        @Override
        public Ref getRef(String name) throws IOException {
            return delegate.getRef(name);
        }

        @Override
        public Map<String, Ref> getRefs(String prefix) throws IOException {
            return delegate.getRefs(prefix);
        }

        @Override
        public List<Ref> getAdditionalRefs() throws IOException {
            return delegate.getAdditionalRefs();
        }

        @Override
        public Ref peel(Ref ref) throws IOException {
            return delegate.peel(ref);
        }
    }

    private static class ObjDb extends ObjectDatabase {
        private final ObjectDatabase delegate;

        private ObjDb(ObjectDatabase delegate) {
            this.delegate = checkNotNull(delegate);
        }

        @Override
        public ObjectInserter newInserter() {
            throw new UnsupportedOperationException(MSG);
        }

        @Override
        public ObjectReader newReader() {
            return delegate.newReader();
        }

        @Override
        public void close() {
            delegate.close();
        }
    }
}